Question

Explain the process of calcination and roasting with examples....4 marks qstn...plz answer fast....

Answer 1

The IUPAC defines it as 'heating to high temperatures in air or oxygen'. However,calcination is also used to mean a thermal treatment process in the absence or limited supply of air or oxygen applied to ores and other solid materials to bring about a thermal decomposition.Roasting is a process of heating of sulphide ore to a high temperature in presence of air. ... In roasting, the ore or ore concentrate is treated with very hot air. Thisprocess is generally applied to sulfide minerals. During roasting, the sulfide is converted to an oxide, and sulfur is released as sulfur dioxide, a gas.

Answer 2

Roasting is the process in which the ore is heated below its melting point in presence of air to oxidise the impurities. eg: carbon, sulphur etc removed as their gaseous oxides.
Calcination is the process of heating the ore below its melting point an absence of air to remove volatile impurities like arsenic. balanced equations for the roasting are:
2ZnS+3O2-->2 Zno+ 2SO2
2 Cu2S + 3O2 → 2 Cu2O + 2 SO2
Example of carbonate : ZnCO3--> ZnO+ C02

I hope this will be helpful please make it brainliest if it really helps you.

thank you. >_<